10-02-Lecture

10-02-Lecture - Mechanical Properties of Materials Part A...

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1 Mechanical Properties of Materials Part A ENGR 213
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MECHANICAL PROPERTIES mechanical properties relate responses to loads ensure deformation not excessive and fracture precluded determined by experiment simulating service conditions Lab scale models standard tests American Society for Testing & Materials (ASTM)
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MECHANICAL PROPERTIES apply load uniformly over cross section static load or changing slowly w/ time tension compression Shear twist
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TENSILE TESTING OF METALS Tension test (LAB) elongate @ constant rate to failure measure applied load; elongation Usually on sample with specific geometry Gauge length should be at least four times the diameter.
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5 Tensile Test Apparatus
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6 Stress and Strain To eliminate effect of sample area, define stress & strain as follows engineering stress Ao - original area Units - psi or Mpa = 1E6 N/m 2 engineering strain lo - original length li - instantaneous length Unitless 0 A F = σ 0 0 0 l l l l l i = - = ε 145 psi = 1 MPa
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10-02-Lecture - Mechanical Properties of Materials Part A...

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